PROJECT CD-183/3

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03172A000300020051-2
• Release Decision: RIFPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: February 14, 2012
• Sequence Number: 51
• Publication Date: September 5, 1958
• Content Type: MISC

? Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2
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Operation and Adjustment of The Silvercel Battery Charger
This battery charger is designed to charge silver-zinc type of
batteries such as the Yardney Silvercel batteries. The charger requires
l lOv. 60 or 50 cycles A. C. power input. (It can be rewired to accept
220v. A. C. - see instructions) For continuous operation, the maximum
charging rate should not exceed one ampere. This charger can be used
for charging batteries with fully charged voltage as high as 40 volts.
Circuit Description:
This charger consists of five subunits. The transformer and
rectifier on the left hand aide of the circuit diagram is a commercial Fansteel
power unit. This transformer has two separate primary winding and a multiple.
tap secondary. The primary winding is connected in parallel for 110 v.
operation, and in series for 220 v. Since this battery charger is intended
for charging batteries with charged voltage less than 40 volts the lowest tap
on the secondary winding, point L-, is used.
The D. C. output from the rectifiers goes to the battery through
an automatic control circuit and a current limiting circuit. The control
circuit automatically removes the charging current when the battery is fully
charged and switches the indicating lamps from "charging" to "charged
condition. This control circuit uses a voltage sensitive meter relay in
conjunction with a power relay. When the battery voltage reaches the get
cut off voltage the relays energizes and remove the charging current. The
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Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2
 Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2
PROJECT CD-183/3
limiting circuit consists of three power resistors in series. They are
adjusted to provide an average charging current of one ampere.
Operation:
1. Set cut off voltage to set position. (All the way to the right)
This is a precautionary step to protect the meter switch and to
insure proper starting.
2. Connect charging leads to the battery terminals (+ of the charger
to + of the battery and - of the charger to - of the battery)
3. Adjust cut off control to desire cut-off voltage. The 16 cell
silver-zinc battery has a full charged of 32 volts. therefore,
set the red pointer to 32 volt position.
4. Connect a. c. power cord to a 110 v. 50 or 60 cycle source.
5. Leave charger on until battery is fully charged.
6. When battery is fully charged, disconnect the battery first and
then disconnect the power cord.
Maintenance:
a. Wiring for 130 volts operation - rewiring of two wires on the
transformer primary is required, the wire from HZ to terminal
No. 3 is changed to terminal No. Z, and the wire from H3 to
terminal No. 1 in changed to terminal No. Z, the same point
that HZ is connected.
Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2
 Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2
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PROJECT CD-183/3
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b. Adjusting charging current - when the battery voltage is low,
less than 24 volts, it may be necessary to use an external
resistor to limit the current to the recommended charging rate
of one ampere. For charging the silver cell 16-LR 40 battery
it is not necessary to adjust the current limiting resistor R4
even thxough the initial charging current is greater than one
ampere, for this current will drop as the battery charges:
c. Replacement of parts - this charger is designed for long life
operation without maintenance. The parts that may require
change are the fuses in case of accidental short circuiting, and
the light bulbs after many hours of operation. Under excessive
uses it may be necessary to clean the meter' relay contacts so as
to prevent unreliable control operation.
Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2
 Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2
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BATTERY CHARGER
FOR YARDNEY Si[ VERCEL
Declassified and Approved For Release 2012/02/14: CIA-RDP78-03172A000300020051-2